Server-side

Server side refers to anything that the host is currently running on his/her server. Mods such as JA+ and other significant game mods are usually installed on the server's host computer. Usually, this means that in order for players to connect onto that server, they must have the required mods and files that the server demands, though in the case of JA+, it is not required for players to have the mod installed in order to play on that particular server.